Configuring BGP4
December 2005 © Foundry Networks, Inc. 21 - 19
file can contain individual parameters listed in the previous section as well as the settings for those
parameters within a peer group.
You can override neighbor parameters that do not affect outbound policy on an individual neighbor basis.
• If you do not specify a parameter for an individual neighbor, the neighbor uses the value in the peer group.
• If you set the parameter for the individual neighbor, that value overrides the value you set in the peer group.
• If you add a parameter to a peer group that already contains neighbors, the parameter value is applied to
neighbors that do not already have the parameter explicitly set. If a neighbor has the parameter explicitly set,
the explicitly set value overrides the value you set for the peer group.
• If you remove the setting for a parameter from a peer group, the value for that parameter changes to the
default value for all the neighbors in the peer group that do not have that parameter individually set.
Configuring a Peer Group
To configure a BGP4 peer group, enter commands such as the following at the BGP configuration level:
FESX424 Router(config-bgp-router)# neighbor PeerGroup1 peer-group
FESX424 Router(config-bgp-router)# neighbor PeerGroup1 description “EastCoast
Neighbors”
FESX424 Router(config-bgp-router)# neighbor PeerGroup1 remote-as 100
FESX424 Router(config-bgp-router)# neighbor PeerGroup1 distribute-list out 1
The commands in this example configure a peer group called “PeerGroup1” and set the following parameters for
the peer group:
• A description, “EastCoast Neighbors”
• A remote AS number, 100
• A distribute list for outbound traffic
The software applies these parameters to each neighbor you add to the peer group. You can override the
description parameter for individual neighbors. If you set the description parameter for an individual neighbor, the
description overrides the description configured for the peer group. However, you cannot override the remote AS
and distribute list parameters for individual neighbors. Since these parameters control outbound traffic, the
parameters must have the same values for all neighbors within the peer group.
Syntax: neighbor <peer-group-name> peer-group
The <peer-group-name> parameter specifies the name of the group and can be up to 80 characters long. The
name can contain special characters and internal blanks. If you use internal blanks, you must use quotation
marks around the name. For example, the command neighbor “My Three Peers” peer-group is valid, but the
command neighbor My Three Peers peer-group is not valid.
To Next Page
Loading...
Need help?
General
